Minstee



UNITED STATES PATENT OFFICE.

JOSEPH THOMPSON, OF WILLESDEN, AND JOHN HENRY BRYANT, OF VEST- MINSTER, COUNTY OF MIDDLESEX, ENGLAND.

ARTIFICIAL STONE.

SPECIPICATIONforming part of Letters Patent No. 359,908, dated March 22, 1887.

Application filed January 25, 1887. Serial No. 225,475. (No specimens.) Patented in EnglandNow-ember 14, 1884, No. 15,014 in France January 22, 1885, No. 166,585, and in Belgium October 13, 1885, No. 70,490.

To all whom it may concern;

Be it known that we, J OSEPH THOMPSON, of 2 Vallier Road, College Park, Willesden, in the county of Middlesex, England, carpenter,

5 and JOHN HENRY BRYANT, of 45 and 46 Palace Chambers, in thecity of Westminster, in the county of Middlesex, England, gentleman, have invented a new and useful Improvement in Artificial Stone, of which the following is a specification.

The object of this invention is to produce an artificial stone which is more particularly suitable for paving and flooring purposes, but which when formed into blocks may be used I 5 for retaining and other walls, the stone being quite impervious to moisture, and fire-proof and of great durability. Y

The invention consists in the employment of Portland cement, granite chippings, ironslag, and silicate of soda, which are mixed together in suitable proportions, with the requisite quantity of water, in the manner usual in making concrete.

The mass, when mixed, may be laid in sit a,

or made into blocks or slabs in molds, slight" pressure, by means of a ram mer or otherwise,

being employed, in order to express the air and to give the mass homogeneity.

The proportions which we prefer to use are:

0 Portland cement, fifteen parts, by measure;

crushed granite, fifteen parts, by measure;

mesh, and the iron-slag through a half-inch .dry material, by preference in fine streams say from the rose of a watering-pot-and the whole mass is turned over two or three times, as in making concrete. The mass may be then laid in site, or. made into slabs or blocks in molds, as before mentioned, and should be allowed to set before use.

The Portlandtcement is used as a binding material, and the granite to give body. The iron-slag gives hardness and durability, as well as the fire-proof quality of the material, while the silicate of soda accelerates the dry ing and increases the hardness and durability of the stone. \Ve may here remark we do not intend to confine ourselves to the exact proportions above stated; but these proportions give what we believe to be the best result.

Having now particularly described and ascertained the nature of our said invention and in what manner the same is to be performed, We declare that what we claim is In the manufacture of artificial stone, the combination of Portland cement, granite chippings, crushed iron-slag, silicate of soda, and 70 water, in the proportions or about the proportions hercin set forth.

JOSEPH THOMPSON. JOHN HENRY BRYANT.

\Vitnesses:

AUG. SPIOAUD, ARTHUR F. FARROW. 

